Oregon is one of the most complex states for income tax filing in the Pacific Northwest — and 2026 brought specific legislative changes that created new state-federal differences for business taxpayers. Tax Preparation in Oregon requires navigating state income tax (up to 9.9%), the Corporate Activity Tax, Oregon’s selective response to the One Big Beautiful Bill Act, and Portland-area city and county taxes that operate on their own schedules. Oregon Senate Bills 1507 and 1510, signed in early 2026, added bonus depreciation addback requirements and extended the pass-through entity tax election. The Bookkeeping Company has prepared Oregon tax returns for Pacific Northwest businesses and residents since 2016.
By Maya Primachenko, Founder · Last updated August 2026
Tax Preparation in Oregon: What Makes Oregon Filing Different in 2026
Oregon’s tax structure diverges from Washington and from the federal tax code in several ways that affect how returns are prepared:
• Oregon has a state income tax — Washington does not. Oregon taxes individual income at graduated rates up to 9.9% on income above $125,000 for single filers in 2026. Pass-through income from S-Corporations, partnerships, and sole proprietorships flows onto the owner’s Oregon personal income tax return and is taxed at these rates — on top of the federal obligation.
• Oregon decoupled from federal bonus depreciation in 2026. Senate Bill 1507, signed April 9, 2026, advanced Oregon’s IRC conformity date to December 31, 2025, but decoupled from federal bonus depreciation under IRC Section 168(k). Oregon businesses that claimed 100% federal bonus depreciation on qualifying property must add it back on their Oregon return and depreciate the asset over the applicable Oregon schedule. This creates separate state and federal depreciation records that must be maintained independently.
• Oregon does not allow the federal QBI deduction on personal income tax. The 20% Qualified Business Income deduction under Section 199A — which is now permanent under federal law — is available on the federal return but must be added back on the Oregon personal income tax return. Oregon pass-through business owners pay Oregon income tax on their full business income, with no state QBI offset.
• Oregon Corporate Activity Tax (CAT) is a separate annual return. Businesses with over $750,000 in Oregon commercial activity must be registered for the CAT, and those over $1 million file an annual return and pay quarterly estimated amounts. The CAT annual return is due April 15 — a separate filing from the corporate excise tax or personal income tax return.
• Portland-area businesses carry additional city and county taxes. The City of Portland Business License Tax, Multnomah County Business Income Tax, and Metro Supportive Housing Services Tax each have their own filing requirements and deadlines — layered on top of Oregon state and federal obligations
What Tax Preparation in Oregon Services Include
Tax Preparation in Oregon from The Bookkeeping Company covers the complete range of individual and business returns:
• Oregon individual income tax returns — Form OR-40 for residents, Form OR-40-N for nonresidents with Oregon-source income, and Form OR-40-P for part-year residents; coordinated with the federal 1040
• Oregon pass-through entity returns — Form OR-20-S for S-Corporations, Form OR-65 for partnerships; entity-level return plus owner’s personal OR-40 with K-1 income, including QBI addback calculations for the Oregon personal return
• Oregon corporate excise tax returns — Form OR-20 for C-Corporations at 6.6% on Oregon taxable income up to $1 million; minimum excise tax calculated based on Oregon sales tier
• Oregon Corporate Activity Tax annual return — gross receipts tracked and the 35% cost subtraction calculated; annual return coordinated with quarterly estimated payment records
• Oregon bonus depreciation addback (2026) — applying SB 1507 adjustments: federal Section 168(k) bonus depreciation claimed is added back on the Oregon return; separate Oregon depreciation schedule maintained and applied
• Portland-area local taxes — City of Portland Business License Tax, Multnomah County Business Income Tax, and Metro tax filings where applicable
• Oregon PTET election (SB 1510) — qualifying pass-through entities can elect to pay Oregon income tax at the entity level rather than through owner’s personal returns; election extended and revised via Senate Bill 1510, signed March 31, 2026
The Bookkeeping Company’s tax preparation services are structured so that Oregon returns are prepared alongside federal returns from the same reconciled bookkeeping data — eliminating the translation errors that arise when state and federal preparation are handled by separate providers.
Oregon Tax Filing Requirements and Deadlines: What Every Taxpayer Needs to Know
Oregon has multiple filing types with different deadlines — missing any one of them triggers interest and penalties at each separate agency:
• Oregon individual income tax (Form OR-40/OR-40-N/OR-40-P): April 15 annual deadline; automatic extension to October 15 if a federal extension is filed. However, any Oregon tax owed is still due by April 15 — the extension is for the return, not for payment. (Oregon DOR — Individual Income Tax)
• Oregon S-Corporation (Form OR-20-S) and Partnership (Form OR-65): March 15, the same as the federal pass-through deadline. Extensions available with federal extension. K-1s must be provided to partners and shareholders in time for their personal filings.
• Oregon C-Corporation (Form OR-20): May 15 — the 15th day of the fifth month following the tax year end; one month after the federal C-Corp April 15 due date. (Oregon DOR — Business Taxes)
• Oregon Corporate Activity Tax annual return: April 15 (15th day of the fourth month following the tax year end); quarterly estimated payments are due April 30, July 31, October 31, and January 31
• Portland Business License Tax and Multnomah County Business Income Tax: deadlines vary by entity type and filing frequency; Portland generally aligns with Oregon state but has its own portal and payment schedule
Oregon automatically extends the filing deadline when a federal extension is filed — but unlike the federal system, Oregon does not require a separate extension form if a federal extension is in place. Payment must still be made by the original due date to avoid interest.
Should You Hire a Tax Preparer for Oregon or File Yourself?
Oregon’s tax complexity makes professional preparation more valuable here than in most states. Here is how to think about the decision:
• DIY may work for: Oregon residents with only W-2 income from a single employer, no business income, no Oregon-sourced investments, no Portland-area city tax obligations, and a straightforward federal return. Free filing options are available for Oregon residents below certain income thresholds through the Oregon Free File Alliance.
• Professional preparation is clearly worth it for: any Oregon business owner (sole proprietor, LLC, S-Corp, or partnership) because the combination of Oregon income tax, CAT, QBI addback, and 2026 bonus depreciation decoupling creates state-federal differences that software designed for federal-first preparation frequently handles incorrectly for Oregon.
• The 2026 bonus depreciation addback makes DIY significantly riskier: Oregon Senate Bill 1507 requires a specific adjustment that most consumer tax software does not apply automatically for Oregon. Businesses that purchased equipment in 2026 and claimed federal bonus depreciation have a mandatory Oregon addback that will be missed by taxpayers who do not specifically configure the state depreciation treatment.
• Portland-area businesses have the highest complexity: managing state income tax, CAT, Portland Business License Tax, Multnomah County Business Income Tax, and Metro tax as separate filings requires a preparer who knows all four systems — not just the state and federal returns.
The IRS recommends looking for a preparer with a PTIN, verifiable credentials, and experience in your specific tax situation. (IRS — Choosing a Tax Professional)
How Much Does Tax Preparation Cost in Oregon?
Oregon tax preparation fees vary by return complexity and the number of Oregon-specific filings required. According to the National Society of Accountants Income and Fees Survey (2025):
• Oregon Form OR-40 (individual, basic): approximately $220 or more, in addition to the federal 1040 preparation fee
• Oregon Form OR-40 with itemized deductions: approximately $323 or more; Oregon’s itemized deductions parallel but do not always match federal, requiring a separate Oregon Schedule A calculation
• Oregon S-Corp (OR-20-S) or Partnership (OR-65): typically bundled with the federal entity return; combined federal and Oregon entity returns run $903 or more, plus owner personal returns separately
• Oregon CAT annual return: additional fee per return above the standard business tax preparation fee; varies by the complexity of the 35% cost subtraction calculation
• Portland Business License Tax and Multnomah County BIT: additional fees per local return; Portland and Multnomah County each require separate filings on their own portals
For Oregon businesses with the new 2026 bonus depreciation addback requirement under SB 1507, additional time is required to compute the Oregon-specific depreciation schedule — which adds scope to any business return preparation. Call The Bookkeeping Company at 360-524-9889 for a specific estimate for your Oregon situation.
Tax Preparation in Oregon: Remote Pacific Northwest Service
Tax Preparation in Oregon from The Bookkeeping Company is delivered remotely via secure document portal — Oregon clients upload records, review draft returns, and sign electronically without an in-person appointment:
• Portland metro area — Oregon income tax, CAT, City of Portland Business License Tax, Multnomah County Business Income Tax, Metro tax, and the 2026 SB 1507 bonus depreciation addback for Portland-area businesses purchasing equipment
• Salem and Willamette Valley — individual and business returns for state agency contractors, agricultural businesses, and professional services firms
• Eugene and Lane County — University-adjacent businesses, tech companies, and individuals with Oregon-source income and growing business complexity
• Bend and Central Oregon — growing business community with Oregon income tax, CAT monitoring as revenue grows, and often cross-state clients with both Oregon and Washington nexus
• Non-resident Oregon taxpayers — Washington residents, California-based businesses, and others with Oregon-source income who need Form OR-40-N prepared alongside their home-state return
The Bookkeeping Company’s location in Vancouver, WA — directly across the Columbia River from Portland — means Oregon’s tax landscape is a core area of expertise, not a peripheral service. Clean bookkeeping throughout the year feeds directly into accurate Oregon returns with no year-end data scramble. See how integrated bookkeeping and tax preparation eliminate the annual gap for Oregon businesses.
Ready for accurate, proactive Tax Preparation in Oregon that navigates state-federal differences? Call The Bookkeeping Company at 360-524-9889 for a free consultation. We serve Oregon businesses and residents statewide — Portland, Salem, Eugene, Bend, and beyond.
Frequently Asked Questions About Tax Preparation in Oregon
How much does tax preparation cost in Oregon?
Oregon individual income tax preparation (Form OR-40) adds approximately $220 or more to the federal 1040 fee for a basic return, more for itemized returns (Source: National Society of Accountants, 2025). Business entity returns — Oregon OR-20-S or OR-65 — are typically bundled with the federal entity return at $903 or more combined. Oregon CAT annual returns, Portland Business License Tax, and Multnomah County Business Income Tax are billed as additional filings per return.
Should I hire a tax preparer or file myself?
Oregon’s tax complexity — state income tax up to 9.9%, CAT, QBI addback (the federal 20% deduction is not available on the Oregon personal return), 2026 bonus depreciation decoupling under SB 1507, and Portland-area local taxes — makes Oregon more complex than most states. W-2-only Oregon filers with simple situations may self-prepare accurately. Any Oregon business income, CAT obligation, Portland-area tax exposure, or equipment purchase with bonus depreciation warrants a professional preparer with Oregon expertise.
What documents do I need for tax preparation?
Oregon tax preparation requires: W-2s and all 1099 types; prior year Oregon return for reference; business income statement and balance sheet; Oregon CAT gross receipts and cost subtraction records; fixed asset schedules (critical in 2026 for bonus depreciation addback under SB 1507); K-1 forms from partnerships or S-Corps; Oregon-source income documentation for non-residents; Portland Business License Tax records; and any notices received from the Oregon DOR or IRS since the prior filing. Prior year Oregon and federal returns are needed as the baseline for any amended returns.
What are Oregon’s state tax filing requirements?
Oregon state tax filing requirements depend on entity type: residents file Form OR-40; nonresidents with Oregon-source income file Form OR-40-N; part-year residents file Form OR-40-P. S-Corporations file Form OR-20-S; partnerships Form OR-65; C-Corporations Form OR-20. Businesses with over $750,000 in Oregon commercial activity must file an Oregon CAT return. Portland-area businesses also file City of Portland Business License Tax, Multnomah County Business Income Tax, and potentially Metro tax returns depending on revenue thresholds.
When is the tax filing deadline?
Oregon individual returns (Form OR-40) are due April 15, with automatic extension to October 15 if a federal extension is filed — but payment is due April 15. S-Corp (OR-20-S) and partnership (OR-65) returns are due March 15. C-Corp (Form OR-20) is due May 15. The Oregon CAT annual return is due April 15. Oregon automatically grants the extension when a federal extension is filed — no separate Oregon extension form is required if the federal extension is in place and the tax owed is paid by the original deadline.
What is Oregon’s kicker credit and how does it work?
Oregon’s kicker credit is returned to taxpayers when actual Oregon income tax collections exceed the official revenue forecast by more than 2%. The surplus is distributed as a credit on the following year’s Oregon income tax return, calculated as a percentage of each taxpayer’s prior-year Oregon tax liability. The kicker is unique to Oregon and can represent a meaningful credit in years when state revenue significantly exceeds forecasts. A tax preparer applies it automatically when eligible based on the prior year’s Oregon tax return.
How does Oregon’s bonus depreciation decoupling affect my business tax return?
Oregon Senate Bill 1507, signed April 9, 2026, decoupled Oregon from federal bonus depreciation under IRC Section 168(k). Oregon businesses that claimed 100% federal bonus depreciation on qualifying property placed in service in 2026 must add that amount back on their Oregon return. The asset is then depreciated on the Oregon return using the applicable Oregon schedule — creating a state-federal difference that requires tracking two separate depreciation computations for every affected asset. Businesses with significant equipment purchases in 2026 should alert their tax preparer to this addback requirement early.
Does The Bookkeeping Company prepare Oregon tax returns?
Yes. The Bookkeeping Company prepares Oregon individual and business tax returns for clients statewide, delivered remotely via secure document portal. Services include Form OR-40, Oregon S-Corp and partnership returns (OR-20-S/OR-65), Oregon CAT annual filings, Portland Business License Tax, Multnomah County Business Income Tax, and 2026 SB 1507 bonus depreciation addback calculations. Oregon PTET election coordination (SB 1510) is also available. Call 360-524-9889 to schedule a free Oregon tax consultation.
About The Bookkeeping Company
The Bookkeeping Company: Tax Strategies & Planning
18523 NE 65th St
Vancouver, WA 98682
Phone: 360-524-9889
Email: thebookkeepingcomp@gmail.com
Service Area: Serving Oregon businesses and residents statewide. Also serving Clark County, WA and all 50 U.S. states. All tax preparation delivered remotely via secure document portal.